FKIE_CVE-2026-31695

Vulnerability from fkie_nvd - Published: 2026-05-01 14:16 - Updated: 2026-05-06 19:19
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free Currently we execute `SET_NETDEV_DEV(dev, &priv->lowerdev->dev)` for the virt_wifi net devices. However, unregistering a virt_wifi device in netdev_run_todo() can happen together with the device referenced by SET_NETDEV_DEV(). It can result in use-after-free during the ethtool operations performed on a virt_wifi device that is currently being unregistered. Such a net device can have the `dev.parent` field pointing to the freed memory, but ethnl_ops_begin() calls `pm_runtime_get_sync(dev->dev.parent)`. Let's remove SET_NETDEV_DEV for virt_wifi to avoid bugs like this: ================================================================== BUG: KASAN: slab-use-after-free in __pm_runtime_resume+0xe2/0xf0 Read of size 2 at addr ffff88810cfc46f8 by task pm/606 Call Trace: <TASK> dump_stack_lvl+0x4d/0x70 print_report+0x170/0x4f3 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 kasan_report+0xda/0x110 ? __pm_runtime_resume+0xe2/0xf0 ? __pm_runtime_resume+0xe2/0xf0 __pm_runtime_resume+0xe2/0xf0 ethnl_ops_begin+0x49/0x270 ethnl_set_features+0x23c/0xab0 ? __pfx_ethnl_set_features+0x10/0x10 ? kvm_sched_clock_read+0x11/0x20 ? local_clock_noinstr+0xf/0xf0 ? local_clock+0x10/0x30 ? kasan_save_track+0x25/0x60 ? __kasan_kmalloc+0x7f/0x90 ? genl_family_rcv_msg_attrs_parse.isra.0+0x150/0x2c0 genl_family_rcv_msg_doit+0x1e7/0x2c0 ? __pfx_genl_family_rcv_msg_doit+0x10/0x10 ? __pfx_cred_has_capability.isra.0+0x10/0x10 ? stack_trace_save+0x8e/0xc0 genl_rcv_msg+0x411/0x660 ? __pfx_genl_rcv_msg+0x10/0x10 ? __pfx_ethnl_set_features+0x10/0x10 netlink_rcv_skb+0x121/0x380 ? __pfx_genl_rcv_msg+0x10/0x10 ? __pfx_netlink_rcv_skb+0x10/0x10 ? __pfx_down_read+0x10/0x10 genl_rcv+0x23/0x30 netlink_unicast+0x60f/0x830 ? __pfx_netlink_unicast+0x10/0x10 ? __pfx___alloc_skb+0x10/0x10 netlink_sendmsg+0x6ea/0xbc0 ? __pfx_netlink_sendmsg+0x10/0x10 ? __futex_queue+0x10b/0x1f0 ____sys_sendmsg+0x7a2/0x950 ? copy_msghdr_from_user+0x26b/0x430 ? __pfx_____sys_sendmsg+0x10/0x10 ? __pfx_copy_msghdr_from_user+0x10/0x10 ___sys_sendmsg+0xf8/0x180 ? __pfx____sys_sendmsg+0x10/0x10 ? __pfx_futex_wait+0x10/0x10 ? fdget+0x2e4/0x4a0 __sys_sendmsg+0x11f/0x1c0 ? __pfx___sys_sendmsg+0x10/0x10 do_syscall_64+0xe2/0x570 ? exc_page_fault+0x66/0xb0 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> This fix may be combined with another one in the ethtool subsystem: https://lore.kernel.org/all/20260322075917.254874-1-alex.popov@linux.com/T/#u
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5adc01506da94dfaab76f3d1b8410a8ca7bfc59dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5bbadf60b121065ffb267ec92018607b9c1c7524Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/789b06f9f39cdc7e895bdab2c034e39c41c8f8d6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c5fa98842783ed227365d1303785de6a67020c8dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1e3aa80e6e04410ba89eaaba4441a0d749d181dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dcb5915696bd7b32b6404a897c24ee47cb23e772Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e90f3e74e1ebc26c461a74be490d322716bcdcb4Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
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  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free\n\nCurrently we execute `SET_NETDEV_DEV(dev, \u0026priv-\u003elowerdev-\u003edev)` for\nthe virt_wifi net devices. However, unregistering a virt_wifi device in\nnetdev_run_todo() can happen together with the device referenced by\nSET_NETDEV_DEV().\n\nIt can result in use-after-free during the ethtool operations performed\non a virt_wifi device that is currently being unregistered. Such a net\ndevice can have the `dev.parent` field pointing to the freed memory,\nbut ethnl_ops_begin() calls `pm_runtime_get_sync(dev-\u003edev.parent)`.\n\nLet\u0027s remove SET_NETDEV_DEV for virt_wifi to avoid bugs like this:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in __pm_runtime_resume+0xe2/0xf0\n Read of size 2 at addr ffff88810cfc46f8 by task pm/606\n\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x4d/0x70\n  print_report+0x170/0x4f3\n  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n  kasan_report+0xda/0x110\n  ? __pm_runtime_resume+0xe2/0xf0\n  ? __pm_runtime_resume+0xe2/0xf0\n  __pm_runtime_resume+0xe2/0xf0\n  ethnl_ops_begin+0x49/0x270\n  ethnl_set_features+0x23c/0xab0\n  ? __pfx_ethnl_set_features+0x10/0x10\n  ? kvm_sched_clock_read+0x11/0x20\n  ? local_clock_noinstr+0xf/0xf0\n  ? local_clock+0x10/0x30\n  ? kasan_save_track+0x25/0x60\n  ? __kasan_kmalloc+0x7f/0x90\n  ? genl_family_rcv_msg_attrs_parse.isra.0+0x150/0x2c0\n  genl_family_rcv_msg_doit+0x1e7/0x2c0\n  ? __pfx_genl_family_rcv_msg_doit+0x10/0x10\n  ? __pfx_cred_has_capability.isra.0+0x10/0x10\n  ? stack_trace_save+0x8e/0xc0\n  genl_rcv_msg+0x411/0x660\n  ? __pfx_genl_rcv_msg+0x10/0x10\n  ? __pfx_ethnl_set_features+0x10/0x10\n  netlink_rcv_skb+0x121/0x380\n  ? __pfx_genl_rcv_msg+0x10/0x10\n  ? __pfx_netlink_rcv_skb+0x10/0x10\n  ? __pfx_down_read+0x10/0x10\n  genl_rcv+0x23/0x30\n  netlink_unicast+0x60f/0x830\n  ? __pfx_netlink_unicast+0x10/0x10\n  ? __pfx___alloc_skb+0x10/0x10\n  netlink_sendmsg+0x6ea/0xbc0\n  ? __pfx_netlink_sendmsg+0x10/0x10\n  ? __futex_queue+0x10b/0x1f0\n  ____sys_sendmsg+0x7a2/0x950\n  ? copy_msghdr_from_user+0x26b/0x430\n  ? __pfx_____sys_sendmsg+0x10/0x10\n  ? __pfx_copy_msghdr_from_user+0x10/0x10\n  ___sys_sendmsg+0xf8/0x180\n  ? __pfx____sys_sendmsg+0x10/0x10\n  ? __pfx_futex_wait+0x10/0x10\n  ? fdget+0x2e4/0x4a0\n  __sys_sendmsg+0x11f/0x1c0\n  ? __pfx___sys_sendmsg+0x10/0x10\n  do_syscall_64+0xe2/0x570\n  ? exc_page_fault+0x66/0xb0\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  \u003c/TASK\u003e\n\nThis fix may be combined with another one in the ethtool subsystem:\nhttps://lore.kernel.org/all/20260322075917.254874-1-alex.popov@linux.com/T/#u"
    }
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  "id": "CVE-2026-31695",
  "lastModified": "2026-05-06T19:19:51.540",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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  "published": "2026-05-01T14:16:19.250",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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